Judge Livingston was appointed United States Circuit Judge for the Second Circuit on May 17, 2007 and entered on duty June 1, 2007. Prior to her appointment she was the Paul J. Kellner Professor of Law at Columbia Law School, where she also served as Vice Dean from 2005 to 2006. Judge Livingston joined the Columbia faculty in 1994. She continues to serve as a member of that faculty as the Paul J. Kellner Professor.

Judge Livingston received her B.A., magna cum laude, in 1980 from Princeton University, where she was elected to Phi Beta Kappa. She received her J.D., magna cum laude, in 1984 from Harvard Law School, where she was an editor on the Harvard Law Review. Following law school, she served as a law clerk to Judge J. Edward Lumbard of the United States Court of Appeals for the Second Circuit.

Judge Livingston was an Assistant United States Attorney in the Southern District of New York from 1986 to 1991 and she served as a Deputy Chief of Appeals in the Criminal Division from 1990 to 1991. She was an associate with the New York law firm of Paul, Weiss, Rifkind, Wharton & Garrison from 1985 to 1986 and again from 1991 to 1992, when she elected to pursue an academic career. Judge Livingston was a member of the University of Michigan's Law School faculty from 1992 until 1994.

Judge Livingston is a co-author of the casebook, Comprehensive Criminal Procedure, and has published numerous academic articles on legal topics. She has taught courses in evidence, criminal law and procedure, and national security and terrorism. From 1994 to 2003, Judge Livingston was a Commissioner on New York City's Civilian Complaint Review Board.